'Angry Birds' arrives on Facebook -- one day early

ESPOO, Finland – The flock of "Angry Birds" fans worldwide received a huge surprise when the game, which was expected to alight at Facebook on Valentine's Day, landed a day early.

"Angry Birds," in which suicidal dive-bombing birds attempt to take out green pigs, had been scheduled for an official Facebook launch between 6:00pm and 9:00pm ET Tuesday -- but it was up and running on the social networking site Monday, to the delight of millions.

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Finish game developer company Rovio said in a statement that the latest version of "Angry Birds" would feature the same game play as the original, as well as added social components, new power-ups and levels exclusive to Facebook.

And if that's not enough to send fans aflutter, "the pigs will have a more prominent role," Rovio promised last year.